I'm looking for something akin to Stroustrup's C++ Programming
Language or The Design and Evolution of C++ for Ruby.  I love
Programming Ruby and it's a great resource, but not quiet deep enough
on all of the internals.  There's Matz's book Ruby in a Nutshell.  I
don't have that one, but I also heard that it's also somewhat an
overview.  I'm making my way through Ruby Hacking Guide, and
appreciate all the work everyone is doing on that, but it's not done
and the machine translation is just too tough to get my head around.

Does anyone have any suggestions for the best resource at the moment?

Thanks,

Michael